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LTC1069-7 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1069-7 Datasheet(HTML) 6 Page - Linear Technology |
6 / 10 page LTC1069-7 6 10697fa TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Swing vs Temperature Supply Current vs Supply Voltage Supply Current vs Clock Frequency PIN FUNCTIONS AGND (Pin 1): Analog Ground. The quality of the analog signal ground can affect the filter performance. For either single or dual supply operation, an analog ground plane surrounding the package is recommended. The analog ground plane should be connected to any digital ground at a single point. For dual supply operation, Pin 1 should be connected to the analog ground plane. For single supply operation, Pin 1 should be bypassed to the analog ground plane with a capacitor 0.47μF or larger. An internal resistive divider biases Pin 1 to half the total power supply. Pin 1 should be buffered if used to bias other ICs. Figure 1 shows the connections for single supply operation. V+, V – (Pins 2, 7): Power Supplies. The V+ (Pin 2) and V– (Pin 7) should be bypassed with a 0.1μF capacitor to an adequate analog ground. The filter’s power supplies should be isolated from other digital or high voltage analog supplies. A low noise linear supply is recommended. Using switching power supplies will lower the signal-to-noise ratio of the filter. Unlike previous monolithic filters, the power supplies can be applied in any order, that is, the positive supply can be applied before the negative supply and vice versa. Figure 2 shows the connections for dual supply operation. NC (Pins 3, 6): No Connection. Pins 3 and 6 are not connected to any internal circuitry; they should be tied to ground. VIN (Pin 4): Filter Input. The filter input pin is internally connected to the inverting inputs of two op amps through a 36k resistor for each op amp. This parallel combination creates an 18k input impedance. TEMPERATURE (°C) –40 –4.7 –4.5 4.2 0 40 60 1069-7 G18 –4.6 4.1 4.0 –20 20 80 100 VS = ±5V fCLK = 2.5MHz fCUTOFF = 100kHz RL = 10k ISOURCE/ISINK = 1mA SUPPLY VOLTAGE (±V) 0 12 1069-7 G19 36 25 20 15 10 5 0 45 85°C –40°C 25°C fCLK = 10Hz CLOCK FREQUENCY (MHz) 0.25 1.25 2.25 3.25 4.25 5.25 1069-7 G20 22 21 20 19 18 17 16 15 14 13 12 11 10 VS = ±5V VS = 5V 1069-7 F01 1k V+ LTC1069-7 CLOCK SOURCE 0.47μF 0.1μF ANALOG GROUND PLANE 8 7 6 5 1 2 3 4 STAR SYSTEM GROUND DIGITAL GROUND PLANE AGND V+ NC VIN VOUT V– NC CLK VOUT VIN Figure 1. Connections for Single Supply Operation |
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Similar Description - LTC1069-7 |
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